a tube box on 9V
- rocklander
- Old Solderhand
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what is it, and what does it do?
got schematic?
got schematic?
world's greatest tautologist ...in the world
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atreidesheir wrote:He should be punched in the vagina.
- Dirk_Hendrik
- Old Solderhand
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- DarkRain
- Solder Soldier
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Just a quick question: You are using 9v to supply tube heaters? It's a little bit under the specified voltage (12.6 between pin 4 and 5) - you could use 12v to supply the whole pedal and get more headroom and also you will be within the specs for the heaters.
Best regards,
Gabriel Tudoran
Best regards,
Gabriel Tudoran
- DrNomis
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Looks like the schematic is based on the Valvecaster.......
Genius is not all about 99% perspiration, and 1% inspiration - sometimes the solution is staring you right in the face.-Frequencycentral.
- Dirk_Hendrik
- Old Solderhand
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Below what we call a building drawing.
The Schematic looks like this:
Note the differences. The building diagram is handy for building the thing, even if you do not know what it does. The schematic is to understand what is going on.
(Thanks Simon, Valvecaster confirmed)
The Schematic looks like this:
Note the differences. The building diagram is handy for building the thing, even if you do not know what it does. The schematic is to understand what is going on.
(Thanks Simon, Valvecaster confirmed)
- DarkRain
- Solder Soldier
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Ok ... but again... wouldn't be more convenient to use a 12V supply then a 9V? ?
Best regards,
Gabriel Tudoran
Best regards,
Gabriel Tudoran
- Dirk_Hendrik
- Old Solderhand
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- DrNomis
- Old Solderhand
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I agree Darkrain, 9V would mean that the cathodes of the valve aren't able to reach their full electron-emission capabilities, also, I seem to remember reading somewhere that if you run a valve at a lower heater voltage, it can lead to something called "Cathode Poisoning", incidentaly, I tried building a Valvecaster but it didn't work well and hummed alot.....
Genius is not all about 99% perspiration, and 1% inspiration - sometimes the solution is staring you right in the face.-Frequencycentral.
- copachino
- Solder Soldier
DrNomis wrote:I agree Darkrain, 9V would mean that the cathodes of the valve aren't able to reach their full electron-emission capabilities, also, I seem to remember reading somewhere that if you run a valve at a lower heater voltage, it can lead to something called "Cathode Poisoning", incidentaly, I tried building a Valvecaster but it didn't work well and hummed alot.....
what about 18VDC??
- DarkRain
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Well ... again why?! Standard voltage for heaters is: 6.3 or 12.6 so i choose 12.6 beacause:copachino wrote:DrNomis wrote:I agree Darkrain, 9V would mean that the cathodes of the valve aren't able to reach their full electron-emission capabilities, also, I seem to remember reading somewhere that if you run a valve at a lower heater voltage, it can lead to something called "Cathode Poisoning", incidentaly, I tried building a Valvecaster but it didn't work well and hummed alot.....
what about 18VDC??
1 i can supply the heaters with the same PSU
2 it's better the 6.3 in terms of voltage
Why to drop 3 volts or 5v on a resistor ... (@300 or 150mA it can get hot) when... you don't have to drop anything and use 12V as supply ...
Best regards,
Gabriel Tudoran
- DrNomis
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copachino wrote:DrNomis wrote:I agree Darkrain, 9V would mean that the cathodes of the valve aren't able to reach their full electron-emission capabilities, also, I seem to remember reading somewhere that if you run a valve at a lower heater voltage, it can lead to something called "Cathode Poisoning", incidentaly, I tried building a Valvecaster but it didn't work well and hummed alot.....
what about 18VDC??
18V DC will burn-out the valve heater, unless you put a resistor in that'll drop about 6V (which means alot of power dissipation in the form of heat), once the heater burns-out the valve is useless......
Genius is not all about 99% perspiration, and 1% inspiration - sometimes the solution is staring you right in the face.-Frequencycentral.
- rocklander
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how much current would it be drawing? would an lm7812 be the ticket?DrNomis wrote:copachino wrote:DrNomis wrote:I agree Darkrain, 9V would mean that the cathodes of the valve aren't able to reach their full electron-emission capabilities, also, I seem to remember reading somewhere that if you run a valve at a lower heater voltage, it can lead to something called "Cathode Poisoning", incidentaly, I tried building a Valvecaster but it didn't work well and hummed alot.....
what about 18VDC??
18V DC will burn-out the valve heater, unless you put a resistor in that'll drop about 6V (which means alot of power dissipation in the form of heat), once the heater burns-out the valve is useless......
world's greatest tautologist ...in the world
Ronsonic wrote:...the lower the stakes the more vicious the combat.
atreidesheir wrote:He should be punched in the vagina.
- DarkRain
- Solder Soldier
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According to the DS it's 150mA per tube @ 12.6v that would be 18-12=6v dropout @ 150mA that would be 1W of power, a 7812 in a To220 package would be ok.rocklander wrote:how much current would it be drawing? would an lm7812 be the ticket?DrNomis wrote:copachino wrote:DrNomis wrote:I agree Darkrain, 9V would mean that the cathodes of the valve aren't able to reach their full electron-emission capabilities, also, I seem to remember reading somewhere that if you run a valve at a lower heater voltage, it can lead to something called "Cathode Poisoning", incidentaly, I tried building a Valvecaster but it didn't work well and hummed alot.....
what about 18VDC??
18V DC will burn-out the valve heater, unless you put a resistor in that'll drop about 6V (which means alot of power dissipation in the form of heat), once the heater burns-out the valve is useless......
Best regards,
Gabriel Tudoran
- Dirk_Hendrik
- Old Solderhand
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- atreidesheir
- Diode Debunker
It would be a beautiful pedal to look at.Dirk_Hendrik wrote:Looking forward to the 4 tube version!
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